Modelling of trona based spray dry scrubbing of SO2

Aydın, Nalan Erdöl; Nasün-Saygılı, Gülhayat

doi:10.1016/j.cej.2006.05.020

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…The most important aspect of carbonation is that it increases the release of CO 2 and water vapor, which can create more gas channels and enrich the pore structure of the absorber. , This change is observed in Figure c. In contrast, as shown in Figure a, the pores have not been obtained in the trona-cracked Sample 1 due to high-temperature sintering.…”

Section: Resultsmentioning

confidence: 97%

Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Tang

Zhang

Luo

2021

Ind. Eng. Chem. Res.

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Spraying trona in a selective catalytic reduction system is an effective way to control SO 3 emission. However, its application in the industry is often hindered by sintering at high temperatures, which reduces the reactivity and limits its wide application. Therefore, in this paper, we study the reaction characteristics of homemade sodium carbonate (Na 2 CO 3 ) with SO 3 in flue gas on a fixed-bed reactor. The mechanism of SO 3 removal by trona was studied. It was found that with an increase in internal diffusion resistance, the rate control step of the reaction gradually changed from the joint control of external diffusion and chemical reaction to that of internal diffusion control. The increase in temperature accelerates the decreasing trend of the internal diffusion coefficient. This is mainly due to the sintering of Na 2 CO 3 caused by high temperatures. When the temperature increases from 260 to 380 °C, the conversion rate decreases by 30%. By improving the pore structure, the sintering of Na 2 CO 3 caused by high temperatures has been alleviated. The carbonation degree increases from 0 to 100%, and the conversion rate increases by 20%. Meanwhile, the competitive reaction caused by SO 2 is also explored, and it is found that the increase in SO 2 concentration only slightly reduces the absorption of SO 3 .

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Section: Resultsmentioning

confidence: 97%

Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Tang

Zhang

Luo

2021

Ind. Eng. Chem. Res.

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“…■ APPENDIX A: ASSOCIATED CHEMICAL REACTIONS Spray dry scrubbing of SO 2 is a process involving sorbent dissolution and SO 2 gas absorption into the alkaline slurry droplet with a series of reactions in the liquid phase within the spray dryer. The following scheme of reactions is postulated to occur in the spray dry scrubbing of SO 2 using hydrated lime, limestone, and trona: 16,22,32 Dissolution of the sorbent into respective alkaline species in the liquid phase…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases

et al. 2023

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This study presents the findings of an investigation involving the absorption of SO2 from flue gases, using three different sorbents, in a spray dryer. Experimentation involved the evaluation of three sorbents, i.e., hydrated lime (Ca[OH]2), limestone (CaCO3), and trona (Na2CO3·NaHCO3·2H2O), and their relevant properties, for flue gas desulfurization by spray dry scrubbing. Experiments were conducted to explore the effects of spray characteristics in the spray drying scrubber on SO2 removal efficiency using the selected sorbents. The ranges of various operating parameters were considered, including the stoichiometric molar ratio of (1.0–2.5), the inlet gas phase temperature of (120–180 °C), and an inlet SO2 concentration of 1000 ppm. The use of trona gave better SO2 removal characteristics; a high SO2 removal efficiency of 94% was recorded at an inlet gas phase temperature of 120 °C and a stoichiometric molar ratio of 1.5. Under the same operating conditions, Ca[OH]2 and CaCO3 gave 82 and 76% SO2 removal efficiency, respectively. Analysis of the desulfurization products by X-ray fluorescence (XRF) and Fourier transform infrared (FTIR) spectroscopy revealed the presence of CaSO3/Na2SO3, a product of the semidry desulfurization reaction. A significant proportion of unreacted sorbent was observed when Ca[OH]2 and CaCO3 sorbents were used at a stoichiometric ratio of 2.0. Trona also gave the highest degree of conversion (96%) at a stoichiometric molar ratio of 1.0. Ca[OH]2 and CaCO3 gave 63 and 59%, respectively, under the same operating conditions.

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“…On the other hand, research on wet desulfurization techniques concentrated on design of absorption columns having higher capacities and better dehydrating performances with substantially lower pressure drops [9,10] as well as on modeling studies using industrial desulfurization process data for validation [11]. Besides the reports on flue gas desulfurization using trona as the sorbent as well as evaluating its SO2 absorption efficiencies and reaction mechanism, it is likely to come across some contributions assessing the effects of gas temperature, stoichiometric ratio and concentration of trona solution on SO2 removal in spray dryers by comparing experimental data with modeling results [12]. On the other hand, process modelling, design and optimization using various simulation programs are frequently resorted to save time and resources [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Use of natural soda ash production process waste for SO2 removal

Tunali

Ertunç

2017

Environ. Protect. Eng.

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Results of ChemCad © 6.0 simulation have been presented on usability of natural soda ash production process waste in order to remove SO2 from flue gas. Properties and concentrations of the solutions used in this study belong to the waste stream of Eti Soda Inc., and the flue gas compositions were acquired from an existing thermal power plant. SO2 and H2O feed rates and flue gas entrance temperature to the absorption tower were optimized through the response surface methodology (RSM) in order to attain highest SO2 removal yields. It has been found that SO2 removal remained at 33.83% when the waste composition was lower than 2 wt. % while 100% SO2 removal was reached as the waste composition was increased to 8 wt. %. This result clearly demonstrates that treatment of natural soda ash production process waste can be done safely and economically while serving as an SO2 removal agent at the same time.

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Modelling of trona based spray dry scrubbing of SO2

Cited by 12 publications

References 12 publications

Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases

Use of natural soda ash production process waste for SO2 removal

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Modelling of trona based spray dry scrubbing of SO2

Cited by 12 publications

References 12 publications

Experimental Study on the Removal of Low-Concentration SO3 by Trona at Medium Temperatures

Experimental Study on the Removal of Low-Concentration SO3 by Trona at Medium Temperatures

Comparative Study of Sorbents for Spray Dry Scrubbing of SO2 from Flue Gases

Use of natural soda ash production process waste for SO2 removal

Contact Info

Product

Resources

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Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Experimental Study on the Removal of Low-Concentration SO₃ by Trona at Medium Temperatures

Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases